Miter-jack.



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MITER JACK APPLIOATION FILED JULY 7. 1905.

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No. 825,188. l PATLNTED JULY s, 1906.

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MITLB. JACK.

lMPLIGATION FILED JULY?. 1905. A

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DANIEL D. CAMERON, OF SAN FRANCISCO, CALIFORNIA.

NIITER-JACK.

Specification of Letters Patent.

Patented July 3, 1906.'

Application filed July 7, 1905. Serial No. 263,742*

1'0 all whom, it puny concern:

Be it known that I, DANIEL D. CAMERON, a citizen of the United States, residing at San Francisco, county of San Francisco, and State of California, have invented a certain new and useful Improvement in Miter-Jacks, of which the following is a specification.

My invention relates to a new and useful improvement in miter-jacks, and has for its object to provide a ruiter-jack which can be manufactured at a comparatively small cost and when folded can be packed in a comparativly small space, and the knife can be quickly adjusted to any position and held in such position while operated, and the fence is so constructed as to pivot from each end, so that all angles can be obtained with one fence; and a further object of my invention is to provide a simple but effective and easily operated means of releasing or pivoting either end of the fence.

Wvith these ends in view this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, the construction and operation will now be described in detail, referring to the accompanying drawings, forming a part of this specification, in which- Figure l is a front elevation of my im proved miter-jack; Fig. 2, a plan view of the same; Fig. 3, a section taken on the line 3 3 of Fig. l; Fig. 4, a perspective view of one end of the fence, showing the bolt-retractor in its normal position with the ends of the bolt extended Fig. 5, a similar view to Fig. 4, showing the boltfretractor turned in the position for retracting the bolts.

A represents the bottom plate of the miter- 'ack.

J B is the front plate of the ruiter-jack, which is hinged to the bottom, so that the two may be folded together when not in use. The legs C are also hinged to the bottom of the lower plate A and may be folded upward j against the lower plate when the device is out of use. The front plate B is provided wit-h an opening D, formed therethrough, slightly larger than the fence E, which is adapted to it therein when the device is to be stored away. In the middle of the fence at each end is arranged a spring bolt-retractor F, which consists of a split spring-ring G, said ring being provided with projections H, extending outward from the same upon each side of the division. These projections H are beveled in opposite directions upon one side, and to the outer end of each of the projections are secured bolts I, one extending upward and the other downward through the end of the fence. The end of the fence is cut away, as indicated at J, to allow the spring bolt-retractor to lie within the fence, so that the same will be flush therewith, and the part of the cut-away portion J in which the projections H lie has its walls beveled, so as to fit the beveled surfaces upon the projections H. Thus when the bolt-retractor J is lying parallel and flush with the fence the beveled surfaces formed upon the fence will allow the projections I-I to spring apart, and thus the ends of the bolts I may spring into holes formed in the top and bottom walls of the opening D in the front plate B, thus dividing the fence at this end; but when the bolt-retractor is pulled outward, so that it stands at right angles to the fence, the beveled surfaces upon the projections I-I coming in contact with the walls of the opening J will cause the projections I-I to be forced toward one another, and the bolts will be retracted and that end of the fence relieved. As there is one of these bolt-retractors at each end of the fence, it is obvious that either end of the fence may be pivoted and the fence swung at any angle desired. The `bolts at the free outer end of the fence can be used to secure the fence at any angle placed by causing the same to enter the holes K, formed in the bottom plate A.

L represents the knife frame or yoke,

which is provided upon its rearward side with a dovetailed tongue L', adapted to slide in a horizontal groove M, formed in the front surface of the front plate B above the opening D. The lower end of the yoke Il is tapered down to a narrow shank, and the lower end of this shank is turned upward, as indicated at L2, and is adapted to slide in a groove formed in the lower edge of the front plate B and eX- tending longitudinally thereof. The knife N is adapted to slide vertically within the yoke close against the Afront surface of the front plate B, and the knife, as usually, is inclined inward and downward upon both sides toward the center and is slotted upward IOO IIO

the left to engage the notches P when the cut-` ting is being done with the right-hand side of the knife or swung in the opposite direction Awhen the cutting is being done with the lefthand side of the knife.

It will thus be seen that I have provided a miter-j ack in which the knife can be instantly set at any position desired, and by making.

the fence so Ytnat it may be pivoted from either end said fence can be set at any angle that could be obtained with a double fence, thus doing away with muchcomplication, and by my improved bolt-retractor either `end of the fence can be easily and quickly released or secured, and when the device is not to be used the yoke holding the knife can beeasily slid from one end of the front plate and the whole machine folded, so that the same can be packed in a comparatively small space and laid away in a tool-chest, if desired.

In practice when the ack is unfolded ready for use the fence is swung to the angle it is desired to cut the work. Then the knife-block is slid in front of the opening D, where it is locked by the pawl Q, so as to take the reaction from the action of the knife, when by reciprocation of the knife or cutter it will cut the work at theangle desired.

Of course I do not wish to be limited to the exact construction here shown, as slight modifications could be made without departing from the spirit of my invention.

Having thus fully described -my invention, what I claim as new and useful is l. In a miter-j ack, a bottom horizontal plate, a front vertical plate hinged to the bottom plate so that the two can be folded together or arranged at right angles to one another, folding legs for supporting the bottom plate, the front plate provided with an opening formed therethrough through which the work is adapted to extend, a fence adapted to be pivoted from either end in either end of the opening, two vertical bolts passing through each end ofthe fence, one extending from the upper edge and one from the lower edge, means for retracting or protruding the ends of said bolts, a knife -frame slidably mounted at the front of the front plate so as to slide longitudinally thereof, a verticallyreciprocating knife carried by said knife'- frame, the cutting edges of said knife being upon the lower side and inclined inward and downward toward the center, means for reciprocating said knife, and means for holding 6 5 w n'ch the material is adapted to rest, means.

for pivoting said fence in either end of the opening, means for securing said fence in any position placed, a knife-frame provided with a dovetail tongue upon the rearward side thereof, the front plate provided with a longitudinal dovetail groove in the front side thereof in which the tongue is adapted to slide, a vertically-reciprocating knife carried by the knifeframe, the cutting edges of said knife being at the lower end thereof u on both sides and being inclined downward) and inward toward the center, a lever pivoted at one end to the knife, the upper edge of the front plate being provided wit notches, a pawl pivoted to the back of the knife-frame adapted to be swung over in either direction to engage the notches so as to hold the knife-frame against pressure from either side, as specified.

3. In a miter-jack, the combination of a vertical front plate and a vertically-reciprocating knife arranged to slide in front of said plate, the front plate provided with an opening formed therethrough, with a fence adapted to be pivoted from either end to the front plate so as to swing above the bottom of the jack, two vertically-reciprocating bolts arranged at each end of the fence, one bolt of each pair extending upward and normally protruding from the upper edge thereof, the other bolt of each pair extending downward and normally protruding from the lower edge thereof, said bolts adapted to enter and enl gage holes in the upper and lower walls of the opening formed through the front plate so that the fence may be pivoted from either end, split s ring-rings arranged in the center of each en of the plate, said plate proL vided with openings in which said rings normally rest when the bolts are protruded, the inner ends of said bolts secured to said split rings upon each side of the division, cam-surfaces formed with the fence adapted to coperate with the rings upon each side of the division when the rings are moved so as to be at right angles to the fence so as to force the divided ends of the rings together and retract the bolts, as specified.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

DANIEL D. CAMERON,

Witnesses:

ALFRED A..ENQUIsT, CLARENCE I. BERRY.

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